drivers/net/ipvlan/ipvlan_main.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  */
   9
  10 #include "ipvlan.h"
  11
  12 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
  13 {
  14         ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj;
  15 }
  16
  17 static void ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
  18 {
  19         struct ipvl_dev *ipvlan;
  20
  21         if (port->mode != nval) {
  22                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  23                         if (nval == IPVLAN_MODE_L3)
  24                                 ipvlan->dev->flags |= IFF_NOARP;
  25                         else
  26                                 ipvlan->dev->flags &= ~IFF_NOARP;
  27                 }
  28                 port->mode = nval;
  29         }
  30 }
  31
  32 static int ipvlan_port_create(struct net_device *dev)
  33 {
  34         struct ipvl_port *port;
  35         int err, idx;
  36
  37         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) {
  38                 netdev_err(dev, "Master is either lo or non-ether device\n");
  39                 return -EINVAL;
  40         }
  41
  42         if (netif_is_macvlan_port(dev)) {
  43                 netdev_err(dev, "Master is a macvlan port.\n");
  44                 return -EBUSY;
  45         }
  46
  47         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
  48         if (!port)
  49                 return -ENOMEM;
  50
  51         port->dev = dev;
  52         port->mode = IPVLAN_MODE_L3;
  53         INIT_LIST_HEAD(&port->ipvlans);
  54         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
  55                 INIT_HLIST_HEAD(&port->hlhead[idx]);
  56
  57         skb_queue_head_init(&port->backlog);
  58         INIT_WORK(&port->wq, ipvlan_process_multicast);
  59
  60         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
  61         if (err)
  62                 goto err;
  63
  64         dev->priv_flags |= IFF_IPVLAN_MASTER;
  65         return 0;
  66
  67 err:
  68         kfree_rcu(port, rcu);
  69         return err;
  70 }
  71
  72 static void ipvlan_port_destroy(struct net_device *dev)
  73 {
  74         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
  75
  76         dev->priv_flags &= ~IFF_IPVLAN_MASTER;
  77         netdev_rx_handler_unregister(dev);
  78         cancel_work_sync(&port->wq);
  79         __skb_queue_purge(&port->backlog);
  80         kfree_rcu(port, rcu);
  81 }
  82
  83 #define IPVLAN_FEATURES \
  84         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
  85          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
  86          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
  87          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
  88
  89 #define IPVLAN_STATE_MASK \
  90         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
  91
  92 static int ipvlan_init(struct net_device *dev)
  93 {
  94         struct ipvl_dev *ipvlan = netdev_priv(dev);
  95         const struct net_device *phy_dev = ipvlan->phy_dev;
  96         struct ipvl_port *port = ipvlan->port;
  97
  98         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
  99                      (phy_dev->state & IPVLAN_STATE_MASK);
 100         dev->features = phy_dev->features & IPVLAN_FEATURES;
 101         dev->features |= NETIF_F_LLTX;
 102         dev->gso_max_size = phy_dev->gso_max_size;
 103         dev->gso_max_segs = phy_dev->gso_max_segs;
 104         dev->hard_header_len = phy_dev->hard_header_len;
 105
 106         netdev_lockdep_set_classes(dev);
 107
 108         ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
 109         if (!ipvlan->pcpu_stats)
 110                 return -ENOMEM;
 111
 112         port->count += 1;
 113
 114         return 0;
 115 }
 116
 117 static void ipvlan_uninit(struct net_device *dev)
 118 {
 119         struct ipvl_dev *ipvlan = netdev_priv(dev);
 120         struct ipvl_port *port = ipvlan->port;
 121
 122         free_percpu(ipvlan->pcpu_stats);
 123
 124         port->count -= 1;
 125         if (!port->count)
 126                 ipvlan_port_destroy(port->dev);
 127 }
 128
 129 static int ipvlan_open(struct net_device *dev)
 130 {
 131         struct ipvl_dev *ipvlan = netdev_priv(dev);
 132         struct net_device *phy_dev = ipvlan->phy_dev;
 133         struct ipvl_addr *addr;
 134
 135         if (ipvlan->port->mode == IPVLAN_MODE_L3)
 136                 dev->flags |= IFF_NOARP;
 137         else
 138                 dev->flags &= ~IFF_NOARP;
 139
 140         list_for_each_entry(addr, &ipvlan->addrs, anode)
 141                 ipvlan_ht_addr_add(ipvlan, addr);
 142
 143         return dev_uc_add(phy_dev, phy_dev->dev_addr);
 144 }
 145
 146 static int ipvlan_stop(struct net_device *dev)
 147 {
 148         struct ipvl_dev *ipvlan = netdev_priv(dev);
 149         struct net_device *phy_dev = ipvlan->phy_dev;
 150         struct ipvl_addr *addr;
 151
 152         dev_uc_unsync(phy_dev, dev);
 153         dev_mc_unsync(phy_dev, dev);
 154
 155         dev_uc_del(phy_dev, phy_dev->dev_addr);
 156
 157         list_for_each_entry(addr, &ipvlan->addrs, anode)
 158                 ipvlan_ht_addr_del(addr);
 159
 160         return 0;
 161 }
 162
 163 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 164                                      struct net_device *dev)
 165 {
 166         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 167         int skblen = skb->len;
 168         int ret;
 169
 170         ret = ipvlan_queue_xmit(skb, dev);
 171         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 172                 struct ipvl_pcpu_stats *pcptr;
 173
 174                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 175
 176                 u64_stats_update_begin(&pcptr->syncp);
 177                 pcptr->tx_pkts++;
 178                 pcptr->tx_bytes += skblen;
 179                 u64_stats_update_end(&pcptr->syncp);
 180         } else {
 181                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 182         }
 183         return ret;
 184 }
 185
 186 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 187                                              netdev_features_t features)
 188 {
 189         struct ipvl_dev *ipvlan = netdev_priv(dev);
 190
 191         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 192 }
 193
 194 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 195 {
 196         struct ipvl_dev *ipvlan = netdev_priv(dev);
 197         struct net_device *phy_dev = ipvlan->phy_dev;
 198
 199         if (change & IFF_ALLMULTI)
 200                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 201 }
 202
 203 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 204 {
 205         struct ipvl_dev *ipvlan = netdev_priv(dev);
 206
 207         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 208                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 209         } else {
 210                 struct netdev_hw_addr *ha;
 211                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 212
 213                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 214                 netdev_for_each_mc_addr(ha, dev)
 215                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 216
 217                 /* Turn-on broadcast bit irrespective of address family,
 218                  * since broadcast is deferred to a work-queue, hence no
 219                  * impact on fast-path processing.
 220                  */
 221                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 222
 223                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 224                             IPVLAN_MAC_FILTER_SIZE);
 225         }
 226         dev_uc_sync(ipvlan->phy_dev, dev);
 227         dev_mc_sync(ipvlan->phy_dev, dev);
 228 }
 229
 230 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
 231                                                     struct rtnl_link_stats64 *s)
 232 {
 233         struct ipvl_dev *ipvlan = netdev_priv(dev);
 234
 235         if (ipvlan->pcpu_stats) {
 236                 struct ipvl_pcpu_stats *pcptr;
 237                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 238                 u32 rx_errs = 0, tx_drps = 0;
 239                 u32 strt;
 240                 int idx;
 241
 242                 for_each_possible_cpu(idx) {
 243                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 244                         do {
 245                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 246                                 rx_pkts = pcptr->rx_pkts;
 247                                 rx_bytes = pcptr->rx_bytes;
 248                                 rx_mcast = pcptr->rx_mcast;
 249                                 tx_pkts = pcptr->tx_pkts;
 250                                 tx_bytes = pcptr->tx_bytes;
 251                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 252                                                            strt));
 253
 254                         s->rx_packets += rx_pkts;
 255                         s->rx_bytes += rx_bytes;
 256                         s->multicast += rx_mcast;
 257                         s->tx_packets += tx_pkts;
 258                         s->tx_bytes += tx_bytes;
 259
 260                         /* u32 values are updated without syncp protection. */
 261                         rx_errs += pcptr->rx_errs;
 262                         tx_drps += pcptr->tx_drps;
 263                 }
 264                 s->rx_errors = rx_errs;
 265                 s->rx_dropped = rx_errs;
 266                 s->tx_dropped = tx_drps;
 267         }
 268         return s;
 269 }
 270
 271 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 272 {
 273         struct ipvl_dev *ipvlan = netdev_priv(dev);
 274         struct net_device *phy_dev = ipvlan->phy_dev;
 275
 276         return vlan_vid_add(phy_dev, proto, vid);
 277 }
 278
 279 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 280                                    u16 vid)
 281 {
 282         struct ipvl_dev *ipvlan = netdev_priv(dev);
 283         struct net_device *phy_dev = ipvlan->phy_dev;
 284
 285         vlan_vid_del(phy_dev, proto, vid);
 286         return 0;
 287 }
 288
 289 static int ipvlan_get_iflink(const struct net_device *dev)
 290 {
 291         struct ipvl_dev *ipvlan = netdev_priv(dev);
 292
 293         return ipvlan->phy_dev->ifindex;
 294 }
 295
 296 static const struct net_device_ops ipvlan_netdev_ops = {
 297         .ndo_init               = ipvlan_init,
 298         .ndo_uninit             = ipvlan_uninit,
 299         .ndo_open               = ipvlan_open,
 300         .ndo_stop               = ipvlan_stop,
 301         .ndo_start_xmit         = ipvlan_start_xmit,
 302         .ndo_fix_features       = ipvlan_fix_features,
 303         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 304         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 305         .ndo_get_stats64        = ipvlan_get_stats64,
 306         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 307         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 308         .ndo_get_iflink         = ipvlan_get_iflink,
 309 };
 310
 311 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 312                               unsigned short type, const void *daddr,
 313                               const void *saddr, unsigned len)
 314 {
 315         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 316         struct net_device *phy_dev = ipvlan->phy_dev;
 317
 318         /* TODO Probably use a different field than dev_addr so that the
 319          * mac-address on the virtual device is portable and can be carried
 320          * while the packets use the mac-addr on the physical device.
 321          */
 322         return dev_hard_header(skb, phy_dev, type, daddr,
 323                                saddr ? : dev->dev_addr, len);
 324 }
 325
 326 static const struct header_ops ipvlan_header_ops = {
 327         .create         = ipvlan_hard_header,
 328         .parse          = eth_header_parse,
 329         .cache          = eth_header_cache,
 330         .cache_update   = eth_header_cache_update,
 331 };
 332
 333 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 334                                              struct ethtool_link_ksettings *cmd)
 335 {
 336         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 337
 338         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 339 }
 340
 341 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 342                                        struct ethtool_drvinfo *drvinfo)
 343 {
 344         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 345         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 346 }
 347
 348 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 349 {
 350         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 351
 352         return ipvlan->msg_enable;
 353 }
 354
 355 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 356 {
 357         struct ipvl_dev *ipvlan = netdev_priv(dev);
 358
 359         ipvlan->msg_enable = value;
 360 }
 361
 362 static const struct ethtool_ops ipvlan_ethtool_ops = {
 363         .get_link       = ethtool_op_get_link,
 364         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 365         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 366         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 367         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 368 };
 369
 370 static int ipvlan_nl_changelink(struct net_device *dev,
 371                                 struct nlattr *tb[], struct nlattr *data[])
 372 {
 373         struct ipvl_dev *ipvlan = netdev_priv(dev);
 374         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 375
 376         if (data && data[IFLA_IPVLAN_MODE]) {
 377                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 378
 379                 ipvlan_set_port_mode(port, nmode);
 380         }
 381         return 0;
 382 }
 383
 384 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 385 {
 386         return (0
 387                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 388                 );
 389 }
 390
 391 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
 392 {
 393         if (data && data[IFLA_IPVLAN_MODE]) {
 394                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 395
 396                 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
 397                         return -EINVAL;
 398         }
 399         return 0;
 400 }
 401
 402 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 403                               const struct net_device *dev)
 404 {
 405         struct ipvl_dev *ipvlan = netdev_priv(dev);
 406         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 407         int ret = -EINVAL;
 408
 409         if (!port)
 410                 goto err;
 411
 412         ret = -EMSGSIZE;
 413         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 414                 goto err;
 415
 416         return 0;
 417
 418 err:
 419         return ret;
 420 }
 421
 422 static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 423                            struct nlattr *tb[], struct nlattr *data[])
 424 {
 425         struct ipvl_dev *ipvlan = netdev_priv(dev);
 426         struct ipvl_port *port;
 427         struct net_device *phy_dev;
 428         int err;
 429         u16 mode = IPVLAN_MODE_L3;
 430
 431         if (!tb[IFLA_LINK])
 432                 return -EINVAL;
 433
 434         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 435         if (!phy_dev)
 436                 return -ENODEV;
 437
 438         if (netif_is_ipvlan(phy_dev)) {
 439                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 440
 441                 phy_dev = tmp->phy_dev;
 442         } else if (!netif_is_ipvlan_port(phy_dev)) {
 443                 err = ipvlan_port_create(phy_dev);
 444                 if (err < 0)
 445                         return err;
 446         }
 447
 448         if (data && data[IFLA_IPVLAN_MODE])
 449                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 450
 451         port = ipvlan_port_get_rtnl(phy_dev);
 452         ipvlan->phy_dev = phy_dev;
 453         ipvlan->dev = dev;
 454         ipvlan->port = port;
 455         ipvlan->sfeatures = IPVLAN_FEATURES;
 456         ipvlan_adjust_mtu(ipvlan, phy_dev);
 457         INIT_LIST_HEAD(&ipvlan->addrs);
 458
 459         /* TODO Probably put random address here to be presented to the
 460          * world but keep using the physical-dev address for the outgoing
 461          * packets.
 462          */
 463         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 464
 465         dev->priv_flags |= IFF_IPVLAN_SLAVE;
 466
 467         err = register_netdevice(dev);
 468         if (err < 0)
 469                 return err;
 470
 471         err = netdev_upper_dev_link(phy_dev, dev);
 472         if (err) {
 473                 unregister_netdevice(dev);
 474                 return err;
 475         }
 476
 477         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 478         ipvlan_set_port_mode(port, mode);
 479
 480         netif_stacked_transfer_operstate(phy_dev, dev);
 481         return 0;
 482 }
 483
 484 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 485 {
 486         struct ipvl_dev *ipvlan = netdev_priv(dev);
 487         struct ipvl_addr *addr, *next;
 488
 489         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 490                 ipvlan_ht_addr_del(addr);
 491                 list_del(&addr->anode);
 492                 kfree_rcu(addr, rcu);
 493         }
 494
 495         list_del_rcu(&ipvlan->pnode);
 496         unregister_netdevice_queue(dev, head);
 497         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 498 }
 499
 500 static void ipvlan_link_setup(struct net_device *dev)
 501 {
 502         ether_setup(dev);
 503
 504         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 505         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 506         dev->netdev_ops = &ipvlan_netdev_ops;
 507         dev->destructor = free_netdev;
 508         dev->header_ops = &ipvlan_header_ops;
 509         dev->ethtool_ops = &ipvlan_ethtool_ops;
 510 }
 511
 512 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 513 {
 514         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 515 };
 516
 517 static struct rtnl_link_ops ipvlan_link_ops = {
 518         .kind           = "ipvlan",
 519         .priv_size      = sizeof(struct ipvl_dev),
 520
 521         .get_size       = ipvlan_nl_getsize,
 522         .policy         = ipvlan_nl_policy,
 523         .validate       = ipvlan_nl_validate,
 524         .fill_info      = ipvlan_nl_fillinfo,
 525         .changelink     = ipvlan_nl_changelink,
 526         .maxtype        = IFLA_IPVLAN_MAX,
 527
 528         .setup          = ipvlan_link_setup,
 529         .newlink        = ipvlan_link_new,
 530         .dellink        = ipvlan_link_delete,
 531 };
 532
 533 static int ipvlan_link_register(struct rtnl_link_ops *ops)
 534 {
 535         return rtnl_link_register(ops);
 536 }
 537
 538 static int ipvlan_device_event(struct notifier_block *unused,
 539                                unsigned long event, void *ptr)
 540 {
 541         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 542         struct ipvl_dev *ipvlan, *next;
 543         struct ipvl_port *port;
 544         LIST_HEAD(lst_kill);
 545
 546         if (!netif_is_ipvlan_port(dev))
 547                 return NOTIFY_DONE;
 548
 549         port = ipvlan_port_get_rtnl(dev);
 550
 551         switch (event) {
 552         case NETDEV_CHANGE:
 553                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 554                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 555                                                          ipvlan->dev);
 556                 break;
 557
 558         case NETDEV_UNREGISTER:
 559                 if (dev->reg_state != NETREG_UNREGISTERING)
 560                         break;
 561
 562                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
 563                                          pnode)
 564                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 565                                                             &lst_kill);
 566                 unregister_netdevice_many(&lst_kill);
 567                 break;
 568
 569         case NETDEV_FEAT_CHANGE:
 570                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 571                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 572                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 573                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 574                         netdev_features_change(ipvlan->dev);
 575                 }
 576                 break;
 577
 578         case NETDEV_CHANGEMTU:
 579                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 580                         ipvlan_adjust_mtu(ipvlan, dev);
 581                 break;
 582
 583         case NETDEV_PRE_TYPE_CHANGE:
 584                 /* Forbid underlying device to change its type. */
 585                 return NOTIFY_BAD;
 586         }
 587         return NOTIFY_DONE;
 588 }
 589
 590 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 591 {
 592         struct ipvl_addr *addr;
 593
 594         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
 595                 netif_err(ipvlan, ifup, ipvlan->dev,
 596                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 597                           ip6_addr, ipvlan->dev->name);
 598                 return -EINVAL;
 599         }
 600         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 601         if (!addr)
 602                 return -ENOMEM;
 603
 604         addr->master = ipvlan;
 605         memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
 606         addr->atype = IPVL_IPV6;
 607         list_add_tail(&addr->anode, &ipvlan->addrs);
 608
 609         /* If the interface is not up, the address will be added to the hash
 610          * list by ipvlan_open.
 611          */
 612         if (netif_running(ipvlan->dev))
 613                 ipvlan_ht_addr_add(ipvlan, addr);
 614
 615         return 0;
 616 }
 617
 618 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 619 {
 620         struct ipvl_addr *addr;
 621
 622         addr = ipvlan_find_addr(ipvlan, ip6_addr, true);
 623         if (!addr)
 624                 return;
 625
 626         ipvlan_ht_addr_del(addr);
 627         list_del(&addr->anode);
 628         kfree_rcu(addr, rcu);
 629
 630         return;
 631 }
 632
 633 static int ipvlan_addr6_event(struct notifier_block *unused,
 634                               unsigned long event, void *ptr)
 635 {
 636         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 637         struct net_device *dev = (struct net_device *)if6->idev->dev;
 638         struct ipvl_dev *ipvlan = netdev_priv(dev);
 639
 640         /* FIXME IPv6 autoconf calls us from bh without RTNL */
 641         if (in_softirq())
 642                 return NOTIFY_DONE;
 643
 644         if (!netif_is_ipvlan(dev))
 645                 return NOTIFY_DONE;
 646
 647         if (!ipvlan || !ipvlan->port)
 648                 return NOTIFY_DONE;
 649
 650         switch (event) {
 651         case NETDEV_UP:
 652                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 653                         return NOTIFY_BAD;
 654                 break;
 655
 656         case NETDEV_DOWN:
 657                 ipvlan_del_addr6(ipvlan, &if6->addr);
 658                 break;
 659         }
 660
 661         return NOTIFY_OK;
 662 }
 663
 664 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 665 {
 666         struct ipvl_addr *addr;
 667
 668         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
 669                 netif_err(ipvlan, ifup, ipvlan->dev,
 670                           "Failed to add IPv4=%pI4 on %s intf.\n",
 671                           ip4_addr, ipvlan->dev->name);
 672                 return -EINVAL;
 673         }
 674         addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
 675         if (!addr)
 676                 return -ENOMEM;
 677
 678         addr->master = ipvlan;
 679         memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
 680         addr->atype = IPVL_IPV4;
 681         list_add_tail(&addr->anode, &ipvlan->addrs);
 682
 683         /* If the interface is not up, the address will be added to the hash
 684          * list by ipvlan_open.
 685          */
 686         if (netif_running(ipvlan->dev))
 687                 ipvlan_ht_addr_add(ipvlan, addr);
 688
 689         return 0;
 690 }
 691
 692 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 693 {
 694         struct ipvl_addr *addr;
 695
 696         addr = ipvlan_find_addr(ipvlan, ip4_addr, false);
 697         if (!addr)
 698                 return;
 699
 700         ipvlan_ht_addr_del(addr);
 701         list_del(&addr->anode);
 702         kfree_rcu(addr, rcu);
 703
 704         return;
 705 }
 706
 707 static int ipvlan_addr4_event(struct notifier_block *unused,
 708                               unsigned long event, void *ptr)
 709 {
 710         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 711         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 712         struct ipvl_dev *ipvlan = netdev_priv(dev);
 713         struct in_addr ip4_addr;
 714
 715         if (!netif_is_ipvlan(dev))
 716                 return NOTIFY_DONE;
 717
 718         if (!ipvlan || !ipvlan->port)
 719                 return NOTIFY_DONE;
 720
 721         switch (event) {
 722         case NETDEV_UP:
 723                 ip4_addr.s_addr = if4->ifa_address;
 724                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 725                         return NOTIFY_BAD;
 726                 break;
 727
 728         case NETDEV_DOWN:
 729                 ip4_addr.s_addr = if4->ifa_address;
 730                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 731                 break;
 732         }
 733
 734         return NOTIFY_OK;
 735 }
 736
 737 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
 738         .notifier_call = ipvlan_addr4_event,
 739 };
 740
 741 static struct notifier_block ipvlan_notifier_block __read_mostly = {
 742         .notifier_call = ipvlan_device_event,
 743 };
 744
 745 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
 746         .notifier_call = ipvlan_addr6_event,
 747 };
 748
 749 static int __init ipvlan_init_module(void)
 750 {
 751         int err;
 752
 753         ipvlan_init_secret();
 754         register_netdevice_notifier(&ipvlan_notifier_block);
 755         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 756         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 757
 758         err = ipvlan_link_register(&ipvlan_link_ops);
 759         if (err < 0)
 760                 goto error;
 761
 762         return 0;
 763 error:
 764         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 765         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 766         unregister_netdevice_notifier(&ipvlan_notifier_block);
 767         return err;
 768 }
 769
 770 static void __exit ipvlan_cleanup_module(void)
 771 {
 772         rtnl_link_unregister(&ipvlan_link_ops);
 773         unregister_netdevice_notifier(&ipvlan_notifier_block);
 774         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 775         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 776 }
 777
 778 module_init(ipvlan_init_module);
 779 module_exit(ipvlan_cleanup_module);
 780
 781 MODULE_LICENSE("GPL");
 782 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
 783 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
 784 MODULE_ALIAS_RTNL_LINK("ipvlan");